package com.maniu.mn_vip_webview;

//import org.junit.Test;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

public class FileZip {

    /**
     * 压缩文件夹
     *
     * @param inputFile
     * @param outputFile
     * @throws Exception
     */
    public static void zipCompress(String inputFile, String outputFile) throws Exception {
        //创建zip输出流
        ZipOutputStream out = new ZipOutputStream(new FileOutputStream(outputFile));
        File input = new File(inputFile);
        compress(out, input, null);
        out.close();
    }

    //递归压缩
    private static void compress(ZipOutputStream out,
                                File input, String name) throws IOException {
        if (name == null) {
            name = input.getName();
        }
        if (input.isDirectory()) {
            File[] flist = input.listFiles();
            if (flist.length == 0) {//如果文件为null，则只需在目的地zip文件中写入一个目录进入
                out.putNextEntry(new ZipEntry(name + "/"));
            } else {
                for (int i = 0; i < flist.length; i++) {
                    compress(out, flist[i], name + "/" + flist[i].getName());
                }
            }
        } else { // 是文件
            // 先往zip包放入一个entry
            out.putNextEntry(new ZipEntry(name));
            FileInputStream fos = new FileInputStream(input);
            BufferedInputStream bis = new BufferedInputStream(fos);
            int len = -1;
            //将源文件写六到zip文件中
            byte[] buf = new byte[1024];
            while ((len = bis.read(buf)) != -1) {
                out.write(buf, 0, len);
            }
            bis.close();
            fos.close();
        }
    }

    /**
     * zip解压
     *
     * @param srcFile     zip源文件
     * @param destDirPath 解压后的目标文件夹
     * @throws RuntimeException 解压失败会抛出运行时异常
     */

    public static void unZip(File srcFile, String destDirPath) throws RuntimeException {
        long start = System.currentTimeMillis();
        // 判断源文件是否存在
        if (!srcFile.exists()) {
            throw new RuntimeException(srcFile.getPath() + "所指文件不存在");
        }
        // 开始解压
        ZipFile zipFile = null;
        try {
            zipFile = new ZipFile(srcFile);
            Enumeration<?> entries = zipFile.entries();
            while (entries.hasMoreElements()) {
                ZipEntry entry = (ZipEntry) entries.nextElement();
                System.out.println("解压" + entry.getName());// js/ js/dj.js aidl.html
                // 如果是文件夹，就创建个文件夹
                if (entry.isDirectory()) {
                    String dirPath = destDirPath + "/" + entry.getName();
                    File dir = new File(dirPath);
                    dir.mkdirs();
                } else {
                    // 如果是文件，就先创建一个文件，然后用io流把内容copy过去
                    File targetFile = new File(destDirPath + "/" + entry.getName());
                    // 保证这个文件的父文件夹必须要存在
                    if (!targetFile.getParentFile().exists()) {
                        targetFile.getParentFile().mkdirs();
                    }
                    targetFile.createNewFile();
                    // 将压缩文件内容写入到这个文件中
                    InputStream is = zipFile.getInputStream(entry);
                    FileOutputStream fos = new FileOutputStream(targetFile);
                    int len;
                    byte[] buf = new byte[32 * 1024];
                    while ((len = is.read(buf)) != -1) {
                        fos.write(buf, 0, len);
                    }
                    // 关流顺序，先打开的后关闭
                    fos.close();
                    is.close();
                }
            }
            long end = System.currentTimeMillis();
            System.out.println("解压完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("unzip error from ZipUtils", e);
        } finally {
            if (zipFile != null) {
                try {
                    zipFile.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

//    @Test
    public void zipCompressTest() {
        try {
            zipCompress("D:\\ziptest", "D:\\wang.zip");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

//    @Test
    public void unzipTest() {
        File srcZipFile = new File("html.zip");
        unZip(srcZipFile, "D:\\testdir");
    }
}
